Prepare for production build

- Downgrade react-native to 0.81.5 (matches Expo SDK 54)
- Downgrade react to 19.1.0 and related @react-native packages
- Disable New Architecture (react-native-nfc-manager untested)
- Add expo install/doctor exclusions for version-locked deps
- Configure babel to strip console.log/warn in production
- Add logger utility for development-only logging
- Add component and data module exports

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -17,12 +17,12 @@
   "dependencies": {
     "@react-navigation/native": "^7.1.27",
     "@react-navigation/native-stack": "^7.9.1",
-    "babel-preset-expo": "^54.0.9",
-    "expo": "^54.0.31",
+    "babel-preset-expo": "~54.0.10",
+    "expo": "~54.0.32",
     "expo-dev-client": "^6.0.20",
     "expo-status-bar": "^3.0.9",
-    "react": "19.2.0",
-    "react-native": "0.83.1",
+    "react": "19.1.0",
+    "react-native": "0.81.5",
     "react-native-nfc-manager": "^3.17.2",
     "react-native-paper": "^5.14.5",
     "react-native-safe-area-context": "~5.6.0",
@@ -33,20 +33,40 @@
     "@babel/core": "^7.25.2",
     "@babel/preset-env": "^7.25.3",
     "@babel/runtime": "^7.25.0",
-    "@react-native/babel-preset": "0.83.1",
-    "@react-native/eslint-config": "0.83.1",
+    "@react-native/babel-preset": "0.81.1",
+    "@react-native/eslint-config": "0.81.1",
     "@types/jest": "^29.5.13",
-    "@types/react": "^19.2.0",
+    "@types/react": "~19.1.0",
     "@types/react-native-vector-icons": "^6.4.18",
-    "@types/react-test-renderer": "^19.1.0",
+    "@types/react-test-renderer": "~19.1.0",
     "babel-plugin-transform-remove-console": "^6.9.4",
     "eslint": "^8.19.0",
     "jest": "^29.6.3",
     "prettier": "2.8.8",
-    "react-test-renderer": "19.2.0",
+    "react-test-renderer": "19.1.0",
     "typescript": "^5.8.3"
   },
   "engines": {
     "node": ">=20"
+  },
+  "expo": {
+    "install": {
+      "exclude": [
+        "react",
+        "react-native",
+        "@types/react",
+        "@react-native/babel-preset",
+        "@react-native/eslint-config",
+        "react-test-renderer"
+      ]
+    },
+    "doctor": {
+      "reactNativeDirectoryCheck": {
+        "exclude": [
+          "react-native-nfc-manager",
+          "react-native-vector-icons"
+        ]
+      }
+    }
   }
 }